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IWDT

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I have set the Independent Watchdog Timer of STM32L152 to a reset period of 28 seconds but it resets MCU in a small fraction of a second.
My code is in below:

                IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
                IWDG_SetPrescaler(IWDG_Prescaler_256);
                IWDG_SetReload(0xFFF);
                IWDG_Enable();


In datasheet it says that IWDT operates with 37KHz clock, so with a prescalar of 256 the reset time should be:
0xFFF/(37000/256)=28 seconds